package br.ufg.inf.servlet;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.Method;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author robson
 */
@WebServlet(name = "Servlet", urlPatterns = {"/Servlet/*"})
public class Servlet extends HttpServlet {

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            String realURI = request.getRequestURI();
            request.setAttribute("realURI", realURI);
            String modulo = request.getParameter("modulo");
            String acao = request.getParameter("acao");

            if (modulo == null) {
                modulo = "tag";
            } 
            if (acao == null) {
                 acao = "listar";
            }
            //Pega o nome do modulo e coloca a primeira letra maiuscula 
            String className = Character.toString(modulo.charAt(0)).toUpperCase() + modulo.substring(1);
            //Cria o endereço da classe 
            String locationClass = "br.ufg.inf." + modulo + "." + className + "Controller";
            //Obtem a class para fazer a chamada do metodo
            Class cl = Class.forName(locationClass);
          
            //Cria a instancia da classe
            Object classAbstrata = cl.newInstance();
            //Obtem declaracao do metodo
            Method metodoAbstrato = cl.getDeclaredMethod(acao,HttpServletRequest.class,HttpServletResponse.class);


            metodoAbstrato.invoke(classAbstrata,request,response);

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (Exception e) {
            out.println(e.getMessage());
        } finally {
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
